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Port 3090 (stss)

IANA assigns port 3090 to stss: Senforce Session Services.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
stss TCP Senforce Session Services Peter Boucher -
stss UDP Senforce Session Services Peter Boucher -

Check what is listening on port 3090

Linux: is anything listening on TCP 3090?
sudo ss -tlnp 'sport = :3090'
Linux: UDP 3090
sudo ss -ulnp 'sport = :3090'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3090
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3090 '
Windows (Command Prompt)
netstat -ano | findstr :3090
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3090 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3090
From Windows
Test-NetConnection HOST -Port 3090
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3090

Block port 3090 in the firewall

ufw
sudo ufw deny 3090/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3090 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3090 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3090' -Direction Inbound -Protocol TCP -LocalPort 3090 -Action Block
ufw
sudo ufw deny 3090/udp
iptables
sudo iptables -A INPUT -p udp --dport 3090 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3090 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3090' -Direction Inbound -Protocol UDP -LocalPort 3090 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.